One mission of the Paul M. Fitts Human Engineering Division of Armstrong Laboratory is to improve the user interface for complex systems through user-centered exploratory development and research activities. In support of this goal, many current projects attempt to advance and exploit user-interface concepts made possible by virtual reality (VR) technologies. Virtual environments may be used as a general purpose interface medium, an alternative display/control method, a data visualization and... Topics: PHOTONS, NORMAL DENSITY FUNCTIONS, NONLINEARITY, CAVITIES
This was a live edit from Darby of the Photonz playing one of their earlier shows at Chuck E. Cheese. I'm not sure about the year on this. This was a birthday party, and there is a spankin' good time! ( 1 reviews ) Topics: GTV, Darby, Photons, Live, Bluegrass, Rock, Party
Analytical and experimental studies were performed to investigate the effect of rim thickness on gear tooth crack propagation. The goal was to determine whether cracks grew through gear teeth (benign failure mode) or through gear rims (catastrophic failure mode) for various rim thicknesses. Gear tooth crack propagation was simulated using a finite element based computer program. Principles of linear elastic fracture mechanics were used. Quarter-point, triangular elements were used at the crack... Topics: PHOTONS, ELECTROMAGNETIC FIELDS, VACUUM, CAVITIES, NONLINEARITY
byKetsdever, Andrew D.; Weaver, David P.; Muntz, E. P
Because of the continuing commitment to activity in low-Earth orbit (LEO), a facility is under development to produce energetic atmospheric species, particularly atomic oxygen, with energies ranging from 5 to 80 eV. This relatively high flux facility incorporates an ion engine to produce the corresponding specie ion which is charge exchanged to produce a neutral atomic beam. Ion fluxes of around 10(exp 15) sec(exp -1) with energies of 20-70 eV have been achieved. A geometrically augmented... Topics: PHOTONS, QUANTUM MECHANICS, BEAM SPLITTERS, INTERFERENCE, INTERFEROMETRY, PARADOXES
The topics discussed include the following: telepresence, telerobotics, teleoperators, man machine systems, robot control, and remote control. Topics: DOWN-CONVERTERS, IDENTIFYING, INTERFEROMETERS, PHOTONS, TIME DEPENDENCE, CAVITIES, IDLERS, SELECTION
Robots involved in high value manipulation must be effectively coupled to a human operator either at the work-site or remotely connected via communication links. In order to make use of experimental performance evaluation data, models must be developed. Powerful models of remote manipulation by humans can be used to predict manipulation performance in future systems based on today's laboratory systems. In this paradigm, the models are developed from experimental data, and then used to predict... Topics: AMPLIFICATION, COHERENT LIGHT, OSCILLATORS, PHOTONS, BEAM SPLITTERS, WIGNER COEFFICIENT
As spacecraft orbit the earth, they encounter a variety of particles and radiation. Charged particles are common enough that a spacecraft can collect substantial charges on its surfaces. If these charges are not bled off, they can accumulate until electrostatic discharges occur between a charged surface and some lower-potential location on the craft. Electrostatic discharge (ESD) is the suspected culprit in a number of spacecraft failures. Silverized Teflon film has become the standard... Topics: PHOTONS, POLARIZATION (CHARGE SEPARATION), DIPOLES, ROTATION, ATOMS, TRAPPING
The hydrostatic bearing promises life and speed characteristics currently unachievable with rolling element bearings alone. In order to achieve the speed and life requirements of the next generation of rocket engines, turbopump manufacturers are proposing hydrostatic bearings to be used in place of, or in series with, rolling element bearings. The design of a hydrostatic bearing is dependent on accurate pressure in the bearing. The stiffness and damping of the hydrostatic bearing is very... Topics: COMPRESSING, COUNTING, DEFORMATION, LASERS, PHOTONS, SELECTION, COMMUTATION, HAMILTONIAN FUNCTIONS
In many movements of the upper limb such as reaching, positioning, and displacing the objects, the hand moves smoothly along a uni-directional planar trajectory with a bell-shaped speed profile. Because of variability of the load, gravitational and velocity interaction forces between its segments, the dynamics of the arm during the motion is very complex. Motion of the upper arm and the forearm are coordinated to produce smooth movements despite such complex dynamics. This coordination... Topics: MATHEMATICAL MODELS, PHOTOMETERS, QUANTUM THEORY, PHOTONS, PROBABILITY THEORY
byMENARD, H. A.; MYHAL, D.; CAMERLAIN, M.; LUSSIER, A
EXPERIENCE WITH A SCREENING METHOD FOR ANTINUCLEAR ANTIBODIES WHICH USES INDIRECT IMMUNOFLUORESCENCE ON FORMALINIZED CHICKEN RED CELLS NUCLEI AS SUBSTRATE IS DISCUSSED. THE METHOD IS INEXPENSIVE, EASY TO STANDARDIZE, EASY TO PERFORM, AND PRESENTS A SENSITIVITY AND SPECIFICITY COMPARABLE TO CLASSICAL METHODS. SERA AND SYNOVIAL FLUIDS FROM PATIENTS WITH RHEUMATIC DISEASES WERE SCREENED. A DISCUSSION OF THE TECHNICAL ASPECTS AND THE CLINICAL APPLICATIONS IS INCLUDED. Topics: ANNIHILATION REACTIONS, OSO-7, COSMIC RAYS, GAMMA RAYS, PHOTONS, POSITRONS
byPoteet, Carl C.; Abu-Khajeel, Hasan; Hsu, Su-Yue
The purpose of this research was to perform sensitivity studies and develop a process to perform thermal and structural analysis and sizing of the latest Metallic Thermal Protection System (TPS) developed at NASA LaRC (Langley Research Center). Metallic TPS is a key technology for reducing the cost of reusable launch vehicles (RLV), offering the combination of increased durability and competitive weights when compared to other systems. Accurate sizing of metallic TPS requires combined thermal... Topics: LASER APPLICATIONS, CONTINUOUS WAVE LASERS, PHOTONS, TARGETS, YAG LASERS, DAMAGE
byShaw, T. L.; Corliss, J. M.; Gundo, D. P.; Mulenburg, G. M.; Breit, G. A.; Griffith, J. B
The high cost and long times required to develop research packages for space flight can often be offset by using ground test techniques. This paper describes a space shuttle launch and reentry simulating using the NASA Ames Research Center's 20G centrifuge facility. The combined G-forces and acoustic environment during shuttle launch and landing were simulated to evaluate the effect on a payload of laboratory rates. The launch G force and acoustic profiles are matched to actual shuttle launch... Topics: INEQUALITIES, PARADOXES, PHOTONS, QUANTUM MECHANICS, EXPERIMENTATION, INTERFERENCE, MEASUREMENT
A space vehicle thermal heat rejection system 10 utilizing separate optimized heat pipe components for the functions of heat acquisition, heat transport, and heat rejection. A honeycomb panel heat pipe evaporator section 20 performs the function of heat acquisition, and forms a closed thermodynamic system with a dual channel heat pipe transport section 30, which performs the function of heat transport. A plurality of truss or channel core heat pipe rejection fins 41 form the condenser section... Topics: HIGH SPEED CAMERAS, IMAGING TECHNIQUES, NUCLEAR MEDICINE, PHOTONS, PATENTS
THE WORLD WILL NOT END IN 2012 Carlos Barrios was born into a Spanish family on El Altiplano, the highlands of . His home was in Huehue tenango, also the dwelling place of the Maya Mam tribe. With other Maya and other indigenous tradition keepers, the Mam carry part of the old ways on Turtle Island ( North America ). They are keepers of time, authorities on remarkable calendars that are ancient, elegant and relevant. Mr. Barrios is a historian, an anthropologist and investigator. After studying... Topics: Barrios, mayan, 2012, 2013, prophecy, ascension, photons, prana, church
In the microgravity environment, the effect of gravity on fluid motion is much reduced. Hence, secondary effects such as vibrations, jitters, surface tension, capillary effects, and electromagnetic forces become the dominant mechanism of fluid convection. Numerous studies have been conducted to investigate fluid behavior in microgravity with the ultimate goal of developing processes with minimal influence from convection. Industrial applications such as crystal growth from solidification of... Topics: HAMILTONIAN FUNCTIONS, RADIATION DISTRIBUTION, RAMAN SPECTRA, DEGENERATION, PHOTONS
The purpose of this lab is to study some properties of light photons, to learn how logarithms can be used to find a power law relationship, and to use this technique to derive the Wien Displacement Law and Stefan-Boltzmann Law. The Temperature of the Surface of the Sun will be estimated using the Wien Displacement Law. Using the Wien Displacement Law it is possible to provide a simple derivation of the Planck Expression. Topics: Light Photons, Wien Displacement Law, Stefan Boltzmann Law, Planck's Constant, spectrum of the sun
The maximal distance of hole teleportation and quantum teleportation is limited by cosmological expansion and cannot exceed the Hubble's radius (c/H0) ~ 13 billions of light years. Entanglement depends on the distance, there is ultimate, fundamental and insuperable distance for teleportation as Hubble sphere. Besides quantum teleportation is limited by anthropic barrier 1 - 100 parsec. - The radius of quantum and hole teleportation depends on speed of movement, the more speed, the more the... Topics: Green zone, Hubble sphere, acceleration, uniform rectilinear motion, cosmological expansion,...
Combustion physics and ignition of hydrogen in supersonic stream of vitiated air or inert gases using stepped-wall injection procedure Topics: ELECTROMAGNETIC ABSORPTION, GAMMA RAYS, INTERGALACTIC MEDIA, INTERSTELLAR GAS, COSMOLOGY,...
Many devices eject a mass of fluid either in one shot or periodically. Examples include heart valves and flapping wings. Often the goal is to maximize the volume of fluid moving as a coherent vortex ring away from the exit. M. Gharib (California Institute of Technology) used a piston to experimentally study fluid ejected from a pipe and found that the largest coherent mass of fluid was attained at a piston stroke (normalized by diameter) of 4 under a variety of circumstances, including... Topics: FLOW CHARACTERISTICS, SPECTROSCOPY, LASER INDUCED FLUORESCENCE, ENTHALPY, LINE SPECTRA, SPECTRAL...
byRevercomb, H. E.; Sromovsky, L. A.; Suomi, V. E.; Boese, R. W
The four entry probes of the Pioneer Venus mission measured the radiative net flux in the atmosphere of Venus at latitudes of 60 deg. N, 31 deg. S, 27 deg. S, and 4 deg. N. The three higher latitude probes carried instruments (small probe net flux radiometers; SNFR) with external sensors. The measured SNFR net fluxes are too large below the clouds, but an error source and correction scheme have been found (H. E. Revercomb, L. A. Sromovsky, and V. E. Suomi, 1982, Icarus 52, 279-300). The... Topics: SOLAR FLARES, IMAGING TECHNIQUES, ASTROPHYSICS, PHOTONS, GAMMA RAYS, COLLIMATORS, ALBEDO,...
The composite materials have been used in aerospace industries for quite some time. Several non-destructive evaluation (NDE) methods have been developed to inspect composites in order to detect flaws, matrix cracking, and delamination. These methods include ultrasonics, acoustic emission, shearography, thermography, X-ray, and digital image correlation. The NDE Branch of Marshall Space Flight Center has recently acquired a thermal imaging NDE system. The same system has been used at NASA... Topics: CRYPTOGRAPHY, OPTICAL FIBERS, QUANTUM MECHANICS, QUANTUM THEORY, SECURITY, SCRAMBLING...
The extractability of ammonia halides (including ammonium thiocyanate) formed as byproducts from the synthesis of Si(NH)2 via ammonolysis of the corresponding silicon tetrahalides using supercritical NH3 as the extraction medium was investigated. It was found that the NH4SCN byproduct of ammonolysis of Si(SCN)4 can be almost completely extracted from the insoluble Si(NH)2 forming a promising system for the synthesis of pure Si(NH)2, one of the best precursors for Si3N4. In addition it was found... Topics: ADIABATIC DEMAGNETIZATION COOLING, SELECTION, SENSITIVITY, TELESCOPES, BOLOMETERS, REFRIGERATING,...
The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) is the follow-on ocean color instrument to the Coastal Zone Color Scanner (CZCS), which ceased operations in 1986, after an eight-year mission. SeaWiFS is expected to be launched in 1996, on the SeaStar satellite, being built by Orbital Sciences Corporation (OSC). The SeaWiFS Project at the National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC), has undertaken the responsibility of documenting all aspects of... Topics: QUANTUM EFFICIENCY, FRANCK-CONDON PRINCIPLE, PHOTONS, LASERS, CRYPTOGRAPHY, OPTICAL PUMPING,...
A three-dimensional large eddy simulation model is used to investigate the sensitivity of ambient stratification with turbulence on the behavior of aircraft wake vortices. Modeled ambient turbulence levels range from very weak to moderate, and stratification levels range from strongly stable to unstable. The results of profound significance from this study are: 1) very little sensitivity between vortex linking time and the level of stratification, 2) the mean vortex separation remained nearly... Topics: PHOTONS, LIGHT SCATTERING, NEAR FIELDS, PHYSICAL OPTICS, OPTICAL PROPERTIES, SPECTROSCOPY,...
byBOJARSKI, Z.; CZYRSKI, W.; EYSMONTT, J.; SERWICKI, H
AUSTENITIC STEELS TYPES OH18N9, IH18N10T, IH1810TB AND IH18N10MT MANUFACTURED IN POLAND AND IMPORTED X10CRNITI X10CRNITI18.9 STEEL WERE INVESTIGATED AFTER SOLUTION HEAT TREATMENT AND ANNEALING AT 500, 650 AND 750 C. THE METHODS USED WERE OPTICAL AND ELECTRON MICROSCOPY, X-RAY PHASE ANALYSIS AND X-RAY MICROANALYSIS. THE FOLLOWING INCLUSIONS WERE OBSERVED IN SOLUTION HEAT TREATED STEELS: IN OH18N9 STEEL NONMETALLIC OXIDE AND SULFIDE INCLUSIONS AND IN THE REMAINING TYPES OF STEELS ALSO CARBIDE,... Topics: GAMMA RAYS, SOLAR FLARES, ELECTROMAGNETIC RADIATION, NUCLEI (NUCLEAR PHYSICS), PHOTONS, RADIO...
Gamma ray absorption processes at high red shifts, and energy dependences of absorption processes in interstellar and intergalactic gas Topics: FREE ELECTRONS, GAMMA RAYS, POSITRON ANNIHILATION, ENERGY SPECTRA, PHOTONS, POSITRONIUM, QUANTUM...
byHarper, David B.; Cook, Anthony; Hostetler, Chris; Hair, John W.; Mack, Terry L
NASA Langley Research Center (LaRC) recently developed the LaRC Airborne High Spectral Resolution Lidar (HSRL) to make measurements of aerosol and cloud distribution and optical properties. The Airborne HSRL has undergone as series of test flights and was successfully deployed on the Megacity Initiative: Local and Global Research Observations (MILAGRO) field mission in March 2006 (see Hair et al. in these proceedings). This paper provides an overview of the design of the Airborne HSRL and... Topics: PLASMAS (PHYSICS), SURVEYS, ELECTROMAGNETIC RADIATION, PHOTONS, SEMICONDUCTORS (MATERIALS), SURFACE...
Main-group pallasites (PMG) are mixtures of iron-nickel metal and magnesian olivine thought to have been formed at the core-mantle boundary of an asteroid . Some have anomalous metal compositions (PMG-am) and a few have atypically ferroan olivines (PMG-as) . PMG metal is consistent with an origin as a late fractionate of the IIIAB iron core . Most PMG olivines have very similar Fe/Mg ratios, likely due to subsolidus redox reaction with the metal . In contrast, minor and trace... Topics: SOLAR ELECTRIC PROPULSION, FABRICATION, SOLAR SAILS, TETHERLINES, AEROCAPTURE, CHEMICAL PROPULSION,...
BUFFY COATS OF PERIPHERAL BLOOD OF DIFFERENT MANIFESTATIONS OF LUPUS ERYTHEMATOSUS WERE STUDIED BY ELECTRON MICROSCOPY FOR THE EXISTENCE OF VIRUSLIKE INTRACYTOPLASMIC TUBULAR STRUCTURES. THEY COULD ALWAYS BE DEMONSTRATED IN THE BLOOD LEUKOCYTES OF SYSTEMIC LUPUS ERYTHEMATOSUS INDEPENDENT OF DURATION, SEVERITY AND PRIOR MEDICAL TREATMENT OF THE DISEASE, BUT WERE COMPLETELY ABSENT IN CHRONIC DISCOID LUPUS ERYTHEMATOSUS. SO FAR THESE INCLUSIONS HAVE BEEN OBSERVED ONLY IN THE ACTIVE DERMAL LESIONS... Topics: CARBON DIOXIDE, HEAT, MARS (PLANET), PHOTODISSOCIATION, PLANETARY ATMOSPHERES, VENUS (PLANET),...
In this paper, coset codes are considered as terminated convolutional codes. Based on this approach, three new general results are presented. First, it is shown that the iterative squaring construction can equivalently be defined from a convolutional code whose trellis terminates. This convolutional code determines a simple encoder for the coset code considered, and the state and branch labelings of the associated trellis diagram become straightforward. Also, from the generator matrix of the... Topics: GAMMA RAY BURSTS, COSMOLOGY, GAMMA RAY OBSERVATORY, PHOTONS, ASTRONOMICAL MODELS, HOMOGENEITY,...
Angular distribution and outflow of photons and positrons during foil bombardment by fast electrons Topics: ANGULAR DISTRIBUTION, POSITRON, ELECTRON BOMBARDMENT, ELECTRONS, FOILS, PHOTONS, POSITRONS, ANGULAR...
Wind-tunnel testing of a hypersonic inlet with rectangular-to-elliptical shape transition has been conducted at Mach 4.0. These tests were performed to investigate the starting and back-pressure limits of this fixed-geometry inlet at conditions well below the Mach 5.7 design point. Results showed that the inlet required side spillage holes in order to self-start at Mach 4.0. Once started, the inlet generated a compression ratio of 12.6, captured almost 80% of available air and withstood a... Topics: X RAY SPECTROSCOPY, GALACTIC CLUSTERS, LYMAN ALPHA RADIATION, CAMERAS, X RAY SPECTRA, RADII, PHOTONS
Ceramic Matrix Composites, with fiber/whisker/particulate reinforcement, possess the attractive properties of ceramics such as high melting temperature, high strength and stiffness at high temperature, low density, excellent environmental resistance, combined with improved toughness and mechanical reliability. These unique properties have made these composites an enabling technology for thermomechanically demanding applications in high temperature, high stress and aggressive environments. On a... Topics: QUANTUM THEORY, PHOTONS, SPECTRA, FREQUENCY ASSIGNMENT, ENERGY LEVELS, MOLECULES, SODIUM, TRAPPING
Results from structural analyses of three tow-placed AS4/977-3 composite panels with both geometric and material nonlinearities are presented. Two of the panels have variable stiffness layups where the fiber orientation angle varies as a continuous function of location on the panel planform. One variable stiffness panel has overlapping tow bands of varying thickness, while the other has a theoretically uniform thickness. The third panel has a conventional uniform-thickness [plus or minus... Topics: CENTROIDS, ACCURACY, POSITION ERRORS, GAMMA RAY BURSTS, X RAY TELESCOPES, REFINING, PHOTONS,...